JPS6011841A - Manufacture of resin composition for photography - Google Patents

Abstract

PURPOSE:To prevent the sticking of a resin composition for photography to a die lip during extrusion molding and the formation of microgrit by adding ultramarine blue, an antioxidant and a stearate to the resin composition contg. low density polyethylene and a titanium dioxide pigment as principal components. CONSTITUTION:A resin composition contg. low density polyethylene and a titanium dioxide pigmet as principal components is prepd. At this time, 0.05-10pts. wt. ultramarine blue, 5-150ppm antioxidant such as 1,3,5-trimethyl-2,4,6-tris(3,5- di-tert.-butyl-4-hydroxybenzyl)-benezene and 0.1-5pts.wt. zinc stearate and/or magnesium stearate are added to 100pts.wt. of the resin composition to obtain the desired resin composition for photography. This resin composition does not stick to a die lip when extrusion-molded into a film, and it gives resin coated paper for photography with little microgrit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a photographic resin composition, more specifically, the photographic resin composition has significantly less occurrence of die lip stains,
It also relates to a photographic resin-coated paper with extremely low microgrit.

The essential structure of photographic resin-coated paper containing a photographic resin composition in its resin layer is already known, for example, as disclosed in U.S. Pat. No. 3,501,298.
In this method, both sides of a paper substrate are coated with resin, and the resin layer on the emulsion-coated side contains a titanium dioxide pigment, a blue pigment, a fluorescent brightener, etc.

However, when melt-extruding a resin composition containing a titanium dioxide pigment, particularly a polyethylene resin composition, into a film from a slit die, needle-like or icicle-like deposits or stains (hereinafter referred to as There is a tendency for die lip stains (simply referred to as die lip stains) to occur, and unfortunately, these die lip stains tend to grow larger and larger as the melt extrusion time progresses.

If this die lip stain occurs during melt extrusion coating, vertical streaks may appear on the surface of the photographic resin-coated paper produced as is, or streak-like unevenness may occur due to uneven coating amount. Sometimes, dirt adheres to the film and is applied, causing foreign matter to appear. As a result, the surface quality of the resin-coated paper produced is significantly impaired, making it completely unsuitable as a photographic support that requires excellent surface quality and having no commercial value.

In addition, the only way to completely remove die lip stains that have occurred is to stop production and clean the die lip, which requires a great deal of effort and time, resulting in a significant drop in productivity. As a result, an urgent solution was required.

On the other hand, the term "microgrit" as used herein refers to microscopic foreign matter or microscopic particles that appear on the surface of the coated resin in photographic resin-coated paper in which at least one side of the paper or synthetic paper base is coated with a resin composition. refers to

There are various causes of microgrit, but for example, the formation of microgrit that appears on photographic resin-coated paper manufactured by melt-extruding photographic resin onto at least one side of a paper or synthetic paper substrate using a melt extruder. The causes are: (1) If the resin itself has a lot of gel formation, (2)
When the molten resin is extruded into a film from the melt extruder through the die, if the temperature cannot be maintained at the appropriate temperature and the flow is uneven, (3) the screen attached to the breaker plate in the melt extruder may If it is dirty, (4)
Examples include cracks in the barrel liner in the melt extruder, and (5) insufficient bending in the melt extruder, but these can often be resolved relatively easily by skilled engineers. .

However, the most difficult countermeasure against microgrit is when microgrit occurs in photographic resin-coated paper, in which a paper or synthetic paper substrate is coated with a resin composition mainly consisting of resin and pigment.

In the first place, the method of incorporating pigments into low-density polyethylene is to create a so-called masterbatch in which pigments are contained in resin at a high concentration in advance, and then dilute and mix them with diluted resin to the desired ratio. It is usual to prepare and use a so-called compound in which a desired composition ratio of pigment is contained in a resin from the beginning.

However, when preparing a masterbatch or compound by melt-kneading a resin and pigment using a normal melt mixing machine such as a Banbury mixer or a kneader, relatively coarse pigment particles may be present in the resin. There is a tendency for pigment particles to be dispersed as is, rather than being dispersed in a fine state, and thus undispersed pigment particles will be present in the masterbatch or compound. As a result, on the resin side of photographic resin-coated paper, at least one side of the paper or synthetic paper substrate is coated with a resin composition mainly composed of pigment and resin produced using the masterbatch or the compound. microgrit will be generated.

The occurrence of microgrit in resin-coated papers used as photographic supports causes serious photographic defects.

That is, when a person is photographed on a photographic paper having microgrit-generated resin-coated paper as a photographic support, if microgrit appears in areas such as the face, the photograph has no commercial value.

By the way, when producing a so-called masterbatch by kneading a resin and a pigment using a mixer such as a Banbury mixer, it is often insufficient to simply knead the two; When melt-extrusion coating is applied onto a support for photographic purposes, the above-mentioned microgrit occurs frequently, resulting in a support that is extremely unsuitable for use as a photographic support. To improve this point, a lubricant such as a fatty acid metal salt is often added during kneading.

However, when a resin composition containing a so-called masterbatch or compound containing these lubricants is melt-extruded using a melt extruder, the die lip stain described above is likely to occur, resulting in a significant decrease in workability and the quality of the photographic support. It was found that it caused deterioration.

Moreover, this tendency is more pronounced when ultramarine blue is included than when titanium dioxide pigment is used alone, and an immediate solution has been desired. This is because in the photographic industry, it is essential to apply ultramarine blue to the resin layer of a photographic support (to create a white appearance), which is called bluing. .

In order to solve this contradiction, the present inventors conducted various studies and found that in a resin composition mainly containing low-density polyethylene and titanium dioxide pigment, 0.05 to 10 parts by weight, antioxidant 5-1
By applying a photographic resin composition containing 50 ppm of zinc stearate and/or 0.1 to 5 parts by weight of magnesium stearate into the resin layer of a photographic support, generation of die lip stain and microgrit can be prevented. It was discovered that this can be effectively prevented, leading to the present invention.

The fatty acid metal salt used in the present invention is effective only when zinc stearate, magnesium stearate, or a combination thereof is used. It was found that it has an adverse effect on the microgrit and microgrit. That is, the excellent effect of the photographic resin composition of the present invention is that in the resin composition mainly containing low density polyethylene and titanium dioxide pigment, a specific amount of ultramarine blue, a specific amount of antioxidant, and This is achieved by combining it with a specific lubricant, and although the reason for this is currently unknown, it is thought to be due to their mutual synergistic effect.

As the antioxidant used in the present invention, any commercially available antioxidant can be used as long as it does not cause any problems when applied to photographic resin compositions, but especially hinderers can be used. Dophenolic antioxidants are preferred. For example, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tetrakis[methylene(3,5-
di-tert-butyl-4-hydroxy-hydrocinnamate)] methane, octadecyl-3.5-di-tert
t-Butyl-4-hydroxy-hydrocinnamate, 2
．． 2'. 2″-Tris[3.5-di-tert-butyl-4-hydroxyphenyl)propionyloxy]ethyl isocyanurate, 1.3,5-tris(4-tert
t-Butyl-3-hydroxy-2,6-di-methylbenzyl)isocyanurate, tetrakis(2.4-di-t
ert-butylphenyl) 4,4'-biphenylene diphosphite, 4,4'-thiobis-(6-tert
-butyl-0-cresol), 2,2'-thiobis-(
6-tert-butyl-4-methylphenol), tris-(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2,2'-methylene-bis-(
4-methyl-6-tert-butylphenol), 4.
4'-methylene-bis-(2,6-di-tert-butylphenol), 4,4'-butylidenebis-(3-methyl-6-tert-butylphenol), 2,6-di-tert-butyl-4- Examples include methylphenol, 4-hydroxy methyl-2,6-di-tert-butylphenol, and 2,6-di-tert-butyl-4-n-butylphenol. Furthermore, two or more kinds of antioxidants may be used in combination depending on the properties of the antioxidants. The content of the antioxidant in the photographic resin composition is 5 to 150 ppm, preferably 5 to 100 ppm, and more preferably 5 to 50 ppm in 100 parts by weight of the resin composition.

Even if the amount of antioxidant is less than 5 ppm, it is still 150 ppm.
Exceeding this is also undesirable as it increases the generation of die lip stains and microgrit. In the present invention, as a method for containing 5 to 150 ppm of antioxidant in the resin composition, a so-called compound in which the antioxidant is previously contained in the low density polyethylene used may be used, or a relatively An appropriate amount of resin containing a high concentration of antioxidant may be used, or the antioxidant may be added when producing the resin composition using a kneader. Furthermore, depending on the type of antioxidant used, the above methods may be combined as appropriate.

As the ultramarine blue used in the present invention, any commercially available ultramarine blue can be used as long as it does not cause any problems when applied to photographic resin compositions. for example,
Aoguchi Gunjo No. manufactured by Daiichi Kasei Kogyo Co., Ltd. 8000, No
．． 4000, No. 3000, No. 2000, Akakuchi Gunjo No. 1900, No. 1500, No. 300, processed ultramarine No. 3000A, No. 1500A, PB-8
0, DV-1, DV-2, etc., and in some cases,
Cosmetic ultramarines such as CB-80, CR-50, DR-1, and DP-3 can also be used. In addition, various types of ultramarine may be used in appropriate combination to produce a desired color.

In the present invention, the amount of ultramarine contained in 100 parts by weight of the resin composition is preferably 0.05 to 10 parts by weight. If the amount exceeds 10 parts by weight, the generation of die lip stains and microgrit will be significantly increased, and if it is less than 0.05 parts by weight, the bluing effect will not be exhibited well.

The content of titanium dioxide pigment in the resin composition in the present invention is usually 15 to 60 parts by weight in 100 parts by weight of the resin composition.
20 to 50 parts by weight are advantageously used in the practice of the present invention.

The titanium dioxide pigment used in the practice of the present invention includes:
Those by sulfuric acid method, those by chlorine method, rutile type,
Any anatase type may be used, but the anatase type is advantageous in terms of whiteness. In addition, titanium dioxide pigments without surface treatment can be used, titanium dioxide pigments coated with an inorganic surface treatment agent such as hydrous aluminum oxide, or organic surface treatment agents such as organopolysiloxane can be used. It is also possible to use a surface treated with a surface treatment agent, or a combination of an inorganic surface treatment agent and an organic surface treatment agent as appropriate.

The low-density polyethylene resin used in the practice of the present invention may be one produced by a tank reactor or a tubular reactor, or a low-density polyethylene resin produced by both methods. Polyethylene resins may be used in appropriate combinations.

Furthermore, materials having various densities and melt viscosity indexes (hereinafter simply referred to as MI) can be used alone or in combination. Further, when preparing the resin composition, other polyolefin resins such as high-density polyethylene, polypropylene, etc. may be mixed as appropriate to the extent that they do not interfere with the use as a photographic resin composition.

The content of the titanium dioxide pigment used in the photographic resin composition of the present invention in the resin layer of the photographic resin-coated paper is 5% by weight or less based on the resin, so that it has no hiding power as a photographic support. On the other hand, if it exceeds 40% by weight, the fluidity etc. will deteriorate, which is not preferable, and the range of 7.5% to 2.5% by weight is particularly preferable.

In the photographic resin composition of the present invention, white pigments such as zinc oxide, talc, and calcium carbonate, coloring pigments such as cobalt blue, cobalt violet, and deep blue, and fluorescent whitening agents may be added to the photographic resin composition of the present invention. Good too.

The photographic resin-coated paper containing the photographic resin composition in at least one resin layer of the present invention is a resin-coated paper containing a photographic resin composition in at least one resin layer. Manufactured by melt extrusion coating from a slit die into a film.

Usually, the melt extrusion temperature is preferably 200°C to 350°C. In addition, before coating the resin composition on the base paper,
It is preferable to subject the base paper to an activation treatment such as corona discharge treatment or fire treatment. The thickness of the resin layer of resin-coated paper is:
Although there are no particular limitations, it is generally advantageous to use extrusion coating to a thickness of about 5 to 50 microns. In addition, in ordinary resin-coated paper in which both sides of the base paper are coated with resin, the resin surface containing titanium dioxide pigment has a glossy surface, a matte surface, a silky surface, etc. depending on the application, and the opposite side has a glossy surface, a matte surface, a silky surface, etc. The back surface is usually a matte surface, and if necessary, the front surface or both the front and back surfaces can be subjected to activation treatment such as corona discharge treatment or fire treatment.

The base paper used in the practice of the present invention is ordinary natural pulp paper,
Although synthetic fibers or so-called synthetic paper made of synthetic resin film may be used, natural pulp paper whose main component is wood pulp such as softwood pulp, hardwood pulp, or mixed pulp of softwood and hardwood is advantageously used. There is no particular restriction on the thickness of the base paper, but a base paper with good surface smoothness is preferred, and its basis weight is preferably 50 to 250 g/m2.

The base paper mainly composed of natural pulp, which is advantageously used in the practice of the present invention, can contain various polymer compound additives. For example, dry paper strength enhancers include cationized starch, cationized polyacrylamide, anionized polyacrylamide, carboxy-modified polyvinyl alcohol, gelatin, etc., and sizing agents include fatty acid salts, rosin derivatives, dialkyl ketene dimer emulsions, and petroleum resin emulsions. , ammonium salt of styrene-maleic anhydride copolymer alkyl ester, pigments such as clay, kaolin, calcium carbonate, barium sulfate, titanium oxide, etc. wet paper strength agents such as melamine resin, urea resin, epoxidized polyamide resin , as a fixing agent, polyvalent metal salts such as aluminum sulfate and aluminum chloride;
pH
As regulators, caustic soda, soda carbonate, hydrochloric acid, etc., as inorganic electrolytes, salt, mirabilite, etc. In addition, dyes, fluorescent brighteners, latex, etc. can be contained in appropriate combinations.

The photographic resin-coated paper to which the photographic resin composition of the present invention is applied can be provided with various silver halide photographic emulsion layers. For example, silver chloride, silver bromide, silver chlorobromide, silver iodobromide, and silver chloroiodobromide emulsion layers can be provided. Also,
A multilayer silver halide photographic constituent layer can be provided by containing a color coupler in the silver halide photographic emulsion layer. As the binder for these silver halide emulsion layers, in addition to ordinary gelatin, hydrophilic polymeric substances such as polyvinylpyrrolidone, polyvinyl alcohol, and polysaccharide sulfate ester compounds can be used.

Further, the above-mentioned silver halide emulsion layer can contain various additives. For example, sensitizing dyes include cyanine dyes and merocyanine dyes; chemical sensitizers include water-soluble gold compounds and sulfur compounds; antifoggants and stabilizers include hydroxy-triazolopyrimidine compounds and mercapto-heterocyclic compounds. Hardeners such as formalin, vinyl sulfone compounds, aziridine compounds, etc. Coating aids such as benzene sulfonates, sulfosuccinates, etc. Anti-staining agents such as dialkylhydroquinone compounds, development accelerators such as hydroquinone, Phenidone and other ultraviolet absorbers, benzotriazole compounds, fluorescent whitening agents, sharpness-enhancing dyes, antistatic agents, pH adjusters, and water-soluble iridium compounds and water-soluble rhodicum compounds during the production and dispersion of silver halide. etc. may be contained in an appropriate combination.

Further, on the back side of the photographic resin-coated paper in the present invention, that is, on the support surface opposite to the side on which the photographic constituent layer, in most cases the silver halide photographic constituent layer, is coated, anti-curl, antistatic, etc. A coating layer consisting of a hydrophilic colloid layer called a back coat layer can be provided for the purpose of preventing adhesion and slippage.

Such a back coat layer may contain a binder, a protective colloid, a curing agent, an antistatic agent, a surfactant, a matting agent, a latex, and the like.

Next, examples will be described in order to explain the present invention more specifically.

Example 1 Low density polyethylene (density 0.918 g/cm2,
Tetrakis[methylene (3.5-di-tert-butyl-4-hydroxy - Hydrocinnamate)] A/O containing methane
A compounded resin is prepared (however, sample No. 1 does not contain it). 67.5 parts by weight of each of these resins were collected in a Banbury mixer, and the amounts of titanium dioxide pigment, ultramarine blue, and zinc stearate and/or magnesium stearate listed in Table 1, Note 1 were added thereto, and the mixture was heated at 150°C. The mixture was thoroughly kneaded to obtain masterbatches containing pigments and the like.

On the other hand, a mixed stock of 50 parts by weight of hardwood bleached kraft pulp and 50 parts by weight of softwood bleached sulfide pulp was beaten to 310 ml of Canadian Standard Freeness.
Further, per 100 parts by weight of pulp, 3 parts by weight of cationized starch, 0.2 parts by weight of anionized polyacrylamide, 0.4 parts by weight of alkyl ketene dimer emulsion (as ketene dimer content), and 0.4 parts by weight of polyaminopolyamide epichlorohydrin resin. Parts by weight were added to form paper with a basis weight of 160 g/m2. The obtained wet paper paper was dried at 110°C, and then 3 parts by weight of carboxy-modified polyvinyl alcohol, 0.05 parts by weight of a fluorescent brightener, 0.002 parts by weight of a blue dye,
Impregnated with 25 g/m2 of impregnating liquid consisting of 0.2 parts by weight of citric acid and 97 parts by weight of water, dried with hot air at 110°C, and then supercalendered at a linear pressure of 90 kg/cm, and then treated with corona discharge on both sides. In this way, a base paper for a photographic resin-coated paper was produced.

Next, apply high-density polyethylene (density 0.96
g/cm2, MI=5) and low density polyethylene (density 0
．． A 1:1 mixture of 92g/cm2, MI=5) was coated to a thickness of 30μ using a melt extrusion coater at a resin temperature of 330°C. Next, 30 parts by weight of a masterbatch containing the titanium dioxide pigment described above and high-density polyethylene (density 0.969/cm2, MI=5) were applied to the surface of the base paper.
30 parts by weight and low density polyethylene (density 0.92g/
A resin composition containing 40 parts by weight (cm2, MI=5) was coated to a thickness of 30μ at a resin temperature of 320°C.
Polyethylene resin-coated papers having different antioxidant contents and containing titanium dioxide pigment, etc., were produced. At this time, the surface of the polyethylene containing titanium dioxide pigment etc. was processed into a completely flat glossy surface, and the surface quality of the back polyethylene was processed into a paper-like matte surface.

Table 1 shows the number of die lip stains when resin compositions having different antioxidant contents and containing titanium dioxide pigments, etc., were used.

The number of die lip stains and the number of microgrits were determined by the following method.

<Number of die-lip stains> Ten types of masterbatches listed in Table 1 having different antioxidant contents and containing titanium dioxide pigment, etc. were prepared under the following conditions using the resin formulations described in the examples.

Using a screw set extruder with an extrusion port diameter of 65 mm and a melt extruder with a T-die of 750 mm width, the melt temperature was 320 mm.
The number of stains generated on the die lip after melt extrusion at 100 rpm and 100 rpm for 2 hours is shown.

<Number of microgrits> The number of microgrits generated on the polyethylene resin surface containing titanium dioxide pigment etc. of photographic polyethylene coated paper produced by the method described in the examples was counted visually.

From Table 1, when 100 parts by weight of the resin composition contains 230 parts by weight of TiO and 1 part by weight of ultramarine, and 1.5 parts by weight of zinc stearate, the composition containing no antioxidant ( Sample No. 1) and one containing 500 to 1000 ppm of antioxidant (Sample No. 7)
and no. It can be seen that samples 8) all showed significant die lip staining and were unsuitable as photographic supports.

On the other hand, it can be seen that the samples containing 5 to 150 ppm of antioxidant (Samples No. 2 to No. 6) were well prevented from generating die lip stains. In addition, those containing 5 to 100 ppm are even better prevented, and even 5 to 50 ppm
It can be seen that those containing m were even better protected.

Separately, magnesium stearate is contained instead of zinc stearate, and antioxidant-containing 350
ppm in combination (Sample No. 9) and in combination with zinc stearate and magnesium stearate with an antioxidant content of 50 ppm (Sample No.
．． 10), it can be seen that the generation of die lip stains is extremely well prevented. In addition, the photographic supports in which the photographic resin compositions according to the present invention were applied in the resin layer were well prevented from generating microgrit, and were suitable as photographic supports.

Example 2 The same low-density polyethylene resin containing 50 ppm of antioxidant as in Example 1 was used, except that a masterbatch containing the titanium dioxide pigment, ultramarine, and each zinc stearate amount listed in Note 2 of Table 2 was used. was carried out in the same manner as in Example 1.

The results obtained are shown in Table 2.

From Table 2, 100 parts by weight of the resin composition contains 230 parts by weight of TiO and 1 part by weight of ultramarine, does not contain zinc stearate, and contains 50 ppm of antioxidant (sample No. 11). It can be seen that although the occurrence of die lip stains is small, the occurrence of microgrit is extremely large, making it unsuitable as a photographic support. In addition, 10 parts by weight of zinc stearate and 50 parts by weight of antioxidant were added.
It can be seen that those containing ppm are unsuitable as photographic supports because they generate a lot of die lip stain and microgrit. On the other hand, the present invention, zinc stearate 0
．． The samples containing 1 to 5 parts by weight of antioxidant and 50 ppm of antioxidant (Samples No. 12 to No. 14) were all extremely well prevented from generating die lip stains and microgrit, and were suitable for photographic supports. A suitable product was obtained.

Example 3 Low density polyethylene (density 0.926 g/cm2,
MI=6), 1.3.5-trimethyl-2.4.6
- Containing 25 ppm of tris(3.5-di-tert-butyl-4-hydroxybenzyl)benzene, A/
Make O compound resin. The above A/O blended resin, titanium dioxide pigment, ultramarine blue and zinc stearate were placed in a Banbury mixer and kneaded well at 150°C so that the contents were as shown in Note 3 of Table 3. Obtained a masterbatch.

The same procedure as in Example 1 was carried out except that the resin composition used in melt extrusion using the extruder described in the Example was as shown in Table 3, Note 4.

The results obtained are shown in Table 3.

From Table 3, 220 parts by weight of TiO, 1 part by weight of zinc stearate, and 25 parts by weight of antioxidant in 100 parts by weight of the resin composition.
In the case of resin compositions containing pm and 0.05 to 10 parts by weight of ultramarine (Samples No. 16 to No. 19), both the generation of die lip stain and microgrit were extremely well prevented. A support suitable for use was obtained. On the other hand, when ultramarine blue was contained in an amount of 15 parts by weight (Sample No. 20), both die lip stain and microgrit were generated in a significantly large amount, making the support unsuitable for use as a photographic support.

Example 4 Low density polyethylene (density 0.918 g/m2, M
I=8) to contain 25 ppm of 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-di-methylbenzyl) in cyanurate to prepare an A/O blended resin. The above A/O blended resin, titanium dioxide pigment, ultramarine blue, and zinc stearate, calcium stearate, or stearic acid were respectively placed in a Banbury mixer so that the contents were as shown in Table 4, note 5, 150
The mixture was thoroughly kneaded at ℃ to obtain a masterbatch containing pigments and the like.

Masterbatch containing the above titanium dioxide pigment etc. 23.
3 parts and low density polyethylene (density 0.926 g/cm
Example 1 was carried out in the same manner as in Example 1, except that a resin composition having a composition of 76.7 parts (MI=6) was applied by melt extrusion.

The results obtained are shown in Table 4.

From Table 4, 3 parts by weight of zinc stearate and 25 ppm of antioxidant were contained in 100 parts by weight of the resin composition (
Sample No. In Example 21), generation of die lip stain and microgrit was extremely well prevented, and a support suitable for use as a photographic support was obtained.

On the other hand, samples containing 3 parts by weight of calcium stearate or stearic acid and 25 ppm of an antioxidant (Sample No. 22, No.
．． Sample No. 23) had a significant amount of die lip stain and microgrit, and was unsuitable as a photographic support.

Example 5 Using each masterbatch listed in Example 1 and Table 1, the resin composition at the time of melt extrusion was prepared by adding 30 parts by weight of the masterbatch, ethylene-propylene copolymer (propylene content 0.1% by weight, density 0. 945 g/cm2, MI=7) and low density polyethylene (density 0.92 g/cm, MI
=7) The same procedure as in Example 1 was carried out except that a resin composition having a composition of 40 parts by weight was used.

As a result, the same results as in Example 1 were obtained.

Example 6 A masterbatch in which only ultramarine was removed from the composition in the masterbatch described in Table 3 and Note 3 of Example 3 was used in Example 3.
(abbreviated as white MB).

In addition to the above white MB, sample No. 3 described in Example 3 Table 3 Note 3 was used. 18 and no. Table 5 shows the 20 masterbatches.
The same procedure as in Example 1 was carried out except for using the resin composition for melt extrusion described in Note 7.

The results obtained are shown in Table 5.

In Example 6, when preparing the masterbatch,
Comparisons were made between two types in which only the ultramarine content was changed, with the same amount of titanium dioxide pigment, amount of ultramarine, zinc stearate, and antioxidant in the resin composition at the time of melt extrusion. Sample No. which is a resin composition. 24
The dye lip stain and microgrit were extremely well prevented from forming, and a support suitable for photographic use was obtained. On the contrary, sample No. 1, which is outside the present invention. 2
Sample No. 5 had a lot of die lip stain and microgrit, and was unsuitable as a photographic support.

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Claims (1)

[Scope of Claims] 1) In a resin composition mainly composed of low density polyethylene and titanium dioxide pigment, 0.05 to 10 parts by weight of ultramarine and 5 to 150 parts of antioxidant in 100 parts by weight of the resin composition.
pm, zinc stearate and/or magnesium stearate in an amount of 0.1 to 5 parts by weight. 2) The method for producing a photographic resin composition according to claim 1, wherein the antioxidant is a hindered phenol type.